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EP0675624A1 - Interface d'abonné de télécommunication - Google Patents

Interface d'abonné de télécommunication Download PDF

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Publication number
EP0675624A1
EP0675624A1 EP95301941A EP95301941A EP0675624A1 EP 0675624 A1 EP0675624 A1 EP 0675624A1 EP 95301941 A EP95301941 A EP 95301941A EP 95301941 A EP95301941 A EP 95301941A EP 0675624 A1 EP0675624 A1 EP 0675624A1
Authority
EP
European Patent Office
Prior art keywords
link
digital line
exchange
customer
switching system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95301941A
Other languages
German (de)
English (en)
Other versions
EP0675624B1 (fr
Inventor
Geoffrey Chopping
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marconi Communications Ltd
Original Assignee
GPT Ltd
Plessey Telecommunications Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GPT Ltd, Plessey Telecommunications Ltd filed Critical GPT Ltd
Publication of EP0675624A1 publication Critical patent/EP0675624A1/fr
Application granted granted Critical
Publication of EP0675624B1 publication Critical patent/EP0675624B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H04M3/302—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs
    • H04M3/303—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs and using PCM multiplexers, e.g. pair gain systems

Definitions

  • Dial-up telecommunication services have been principally concerned with providing low bandwidth circuits between subscribers that are capable of carrying speech.
  • Non dial-up telecommunications services have been provided as permanent private circuits at various bandwidths. Many of these private circuits consist of digital bit streams. Because the data carried by many of these digital private circuits is supplied by the customer, the operator of the telecommunication service does not have any control over the data transported and therefore may have no opportunity for routinely inserting known data formats in order to ensure that the bit streams are being correctly transported.
  • a telecommunications network and switching system offering dial-up switched services comprising: an exchange including call control means and a service switch with exchange digital line terminations; access links to customers for both digital circuits and signalling means; a loop test unit at the customer's premises near to the customer digital line terminals; and wherein means is provided to determine when no call is in progress on an transmission access link in order that the exchange digital line termination may transmit over that link a standard test sequence recognisable by the loop test unit so that a composite test sequence may be returned from the loop test unit to the same exchange digital line termination so as to enable the error performance of both directions of the link to be determined by that exchange digital line termination.
  • Figure 1 shows a diagrammatic representation of a transmission link and a signalling link from the exchange to the subscriber's digital line terminal.
  • Figure 2 shows a diagrammatic representation of an exchange digital line termination with means for test pattern insertion and for test pattern monitoring.
  • Figure 3 shows a diagrammatic representation of a test loop unit with means of providing a test loop and for test pattern monitoring.
  • the transmission arrangements consist of a signalling link and a 2048 kbit/s link herein referred to as a 2 Mbit/s link.
  • a 2 Mbit/s link When the 2 Mbit/s link is carrying customer traffic it may be using one of many possible types of format. Unlike a permanent private circuit which can be carrying continuous customer traffic; a 2 Mbit/s dial-up service link is not always carrying customer traffic.
  • An ordinary subscriber low bandwidth analogue copper pair is in a reduced power state when not in use; a 2 Mbit/s line normally stays fully powered even when not carrying useful customer traffic. Consequently for a dial-up 2 Mbit/s service the link regularly has no call in progress.
  • the exchange digital line termination can be instructed to continuously insert a defined test sequence.
  • a means by which call control can indicate to the exchange digital line termination that there is no call in progress is by clearing a path across the digital switch providing that the resultant idle pattern from the switch can be clearly distinguished from normal data when a path is established.
  • An example of such a case is when recognisable SDH formats are carried by the switch when a path is established and the idle patterns are chosen so that they cannot imitate the SDH formats.
  • a formatted test sequence based on a G.704 format of 32 time slots with a 4 bit cyclic redundancy (CRC-4) check comprises: a time slot zero containing a frame alignment signal as well as a CRC-4 multiframe and correct CRC-4 check sums for the transmitted data; a further 31 time slots containing standard and recognisable patterns.
  • CRC-4 cyclic redundancy
  • test loop unit functions as part of the access network and is not part of the subscriber's digital line terminal, though it is appropriate to site a test loop unit at the customer's premises.
  • a test loop unit contains means for recognising the test sequence that has been inserted by the exchange digital line termination.
  • the test loop unit replaces the digital stream from the subscriber's digital line terminal with the test sequence from the exchange digital line termination except that the time slot zero contains a new frame alignment signal as well as a CRC-4 multiframe and correct CRC-4 check sums for the transmitted data.
  • time slot zero contains a new frame alignment signal as well as a CRC-4 multiframe and correct CRC-4 check sums for the transmitted data.
  • Also included in the time slot zero are any remote alarm indications signal and CRC-4 error indication bits relating to the 2 Mbit/s interface received by the test loop unit from the exchange digital line termination.
  • the exchange digital line termination can determine the error performance of both directions of transmission of the link from the exchange digital line termination as far as the loop test unit at the subscribers premises.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
EP95301941A 1994-03-29 1995-03-23 Interface d'abonné de télécommunication Expired - Lifetime EP0675624B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9406212 1994-03-29
GB9406212A GB9406212D0 (en) 1994-03-29 1994-03-29 Telecommunication customer interface

Publications (2)

Publication Number Publication Date
EP0675624A1 true EP0675624A1 (fr) 1995-10-04
EP0675624B1 EP0675624B1 (fr) 2001-11-14

Family

ID=10752696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95301941A Expired - Lifetime EP0675624B1 (fr) 1994-03-29 1995-03-23 Interface d'abonné de télécommunication

Country Status (4)

Country Link
US (1) US5636260A (fr)
EP (1) EP0675624B1 (fr)
DE (1) DE69523803T2 (fr)
GB (2) GB9406212D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6128761A (en) * 1996-12-13 2000-10-03 Cisco Technology, Inc. Method and apparatus for G.706 frame alignment and CRC procedure test tool
US6263318B1 (en) * 1998-02-06 2001-07-17 Hitachi, Ltd. Contents sales method and cyber mall system using such method and storage medium storing therein its contents sales program
CN102307254A (zh) * 2011-08-30 2012-01-04 广东欧珀移动通信有限公司 一种实现手机mo和mt自动化测试的方法

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI107856B (fi) * 1994-06-15 2001-10-15 Nokia Networks Oy Tilaajamultiplekseri, puhelinjärjestelmä, sekä menetelmä tilaajaliitännän kunnon viestittämiseksi puhelinkeskukselle
US5835566A (en) * 1996-03-29 1998-11-10 Telecom Technologies, Inc. System and method for providing in-band and out-of-band testing of telecommunications network components
US5875230A (en) * 1996-12-20 1999-02-23 At&T Corp. Interactive measurement system and method for telecommunication networks
US6128369A (en) * 1997-05-14 2000-10-03 A.T.&T. Corp. Employing customer premises equipment in communications network maintenance
US6366644B1 (en) * 1997-09-15 2002-04-02 Cisco Technology, Inc. Loop integrity test device and method for digital subscriber line (XDSL) communication
US5966427A (en) * 1997-09-30 1999-10-12 Siemens Information Apparatus and method for troubleshooting internet protocol telephony networks
US6181775B1 (en) 1998-11-25 2001-01-30 Westell Technologies, Inc. Dual test mode network interface unit for remote testing of transmission line and customer equipment
US6278769B1 (en) 1998-11-25 2001-08-21 Westell Technologies, Inc. Signaling method for invoking a test mode in a network interface unit
WO2000069152A1 (fr) * 1999-05-10 2000-11-16 Westell Technologies, Inc. Procede de signalisation permettant d'appeler un mode test dans une interface de reseau local
US20030083838A1 (en) * 2001-10-31 2003-05-01 Barrett Richard M. Wireless test and measurement method
US7706258B2 (en) * 2004-12-22 2010-04-27 Alcatel Lucent System and method for detecting loops in a customer-provider bridge domain

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU494731B2 (en) * 1975-06-30 1978-01-05 L M Ericsson Pty. Ltd. Digital testing and power control in a digital communication system
DE3135561A1 (de) * 1981-09-08 1983-03-17 Siemens AG, 1000 Berlin und 8000 München Verfahren zur routinepruefung digitaler fernsprechanschluesse
EP0202648A2 (fr) * 1985-05-20 1986-11-26 Fujitsu Limited Système de réseau numérique comportant un dispositif pour tester une ligne d'abonné numérique
EP0208327A1 (fr) * 1985-07-11 1987-01-14 Siemens Aktiengesellschaft Raccordement numérique d'abonné

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
EP0091267B1 (fr) * 1982-04-05 1988-01-07 THE GENERAL ELECTRIC COMPANY, p.l.c. Unité de bouchage pour système de télécommunication
CA1203875A (fr) * 1983-06-16 1986-04-29 Mitel Corporation Circuit de retour pour verifier un systeme de commutation
GB2158326B (en) * 1984-04-26 1987-08-26 Standard Telephones Cables Ltd Testing arrangements of a digital switching systems
US4575584A (en) * 1984-07-05 1986-03-11 Honeywell Inc. Fail-safe digital phone
US4670898A (en) * 1986-01-03 1987-06-02 Harris Corporation Direct access test unit for central office
US4984262A (en) * 1989-03-03 1991-01-08 Nippon Telegraph And Telephone Corporation Digital service unit
JPH04127743A (ja) * 1990-09-19 1992-04-28 Fujitsu Ltd 広帯域ｉｓｄｎにおける伝送路試験方式
US5343461A (en) * 1991-08-27 1994-08-30 Ameritech Services, Inc. Full duplex digital transmission facility loop-back test, diagnostics and maintenance system
US5490199A (en) * 1992-02-21 1996-02-06 At&T Corp. Non-intrusive network-based analysis of facsimile transmissions
US5224149A (en) * 1992-02-26 1993-06-29 Teltrend, Inc. Testing system for digital transmission lines
US5361293A (en) * 1992-04-16 1994-11-01 Alcatel Network Systems, Inc. Line/drop testing from a craft terminal using test unit
US5359646A (en) * 1992-04-30 1994-10-25 Bell Communications Research, Inc. Testing of distributed communications networks
SE501021C2 (sv) * 1993-04-01 1994-10-24 Ericsson Telefon Ab L M Anordning för provning av linjeanslutningar vid telefonväxel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU494731B2 (en) * 1975-06-30 1978-01-05 L M Ericsson Pty. Ltd. Digital testing and power control in a digital communication system
DE3135561A1 (de) * 1981-09-08 1983-03-17 Siemens AG, 1000 Berlin und 8000 München Verfahren zur routinepruefung digitaler fernsprechanschluesse
EP0202648A2 (fr) * 1985-05-20 1986-11-26 Fujitsu Limited Système de réseau numérique comportant un dispositif pour tester une ligne d'abonné numérique
EP0208327A1 (fr) * 1985-07-11 1987-01-14 Siemens Aktiengesellschaft Raccordement numérique d'abonné

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
R.WIECHERS: "EIN NEUER STANDARD VERANDERT DIE WELT", FUNKSCHAU, no. 14, 28 June 1991 (1991-06-28), MUNCHEN DE, pages 56 - 59 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6128761A (en) * 1996-12-13 2000-10-03 Cisco Technology, Inc. Method and apparatus for G.706 frame alignment and CRC procedure test tool
US6263318B1 (en) * 1998-02-06 2001-07-17 Hitachi, Ltd. Contents sales method and cyber mall system using such method and storage medium storing therein its contents sales program
CN102307254A (zh) * 2011-08-30 2012-01-04 广东欧珀移动通信有限公司 一种实现手机mo和mt自动化测试的方法
CN102307254B (zh) * 2011-08-30 2013-10-09 广东欧珀移动通信有限公司 一种实现手机mo主叫自动化测试的方法

Also Published As

Publication number Publication date
GB2288099A (en) 1995-10-04
GB2288099B (en) 1998-12-23
GB9406212D0 (en) 1994-05-18
EP0675624B1 (fr) 2001-11-14
DE69523803D1 (de) 2001-12-20
DE69523803T2 (de) 2002-11-21
GB9505927D0 (en) 1995-05-10
US5636260A (en) 1997-06-03

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